In Haproxy for frontend, we have to listen to both 80 and 443 port for HTTP and HTTPS. But what if we want to force redirect all requests to https? HAProxy doesn’t support things like htaccess/mod_rewrite. So we have to do it using HAProxy directives and attributes.
HAProxy has a directive called ‘ssl_fc’. This one returns true if the HAProxy frontend is on https. We can use this to force redirect reqeusts to HTTPS as following:
#redirect to HTTPS if ssl_fc is false / off.
redirect scheme https code 301 if !{ ssl_fc }
You can add this code to the section where you have defined the frontend for 80.
Now, you can also redirect reqeusts to https based on the requested domain as following:
redirect scheme https code 301 if { hdr(Host) -i www.yourdomain.com } !{ ssl_fc }
Replace your domain with your expected domain name.